evaluation of antioxidant properties of elaeocarpus ganitrus roxb. leaves

ethanolic extract of leaves of elaeocarpus ganitrus was analyzed for their total antioxidant capacity, reducing power, metal chelating, abts+ (2, 2-azinobis-(3-ethylbenzothiazoline-6-sulphonate) radical scavenging and hydroxyl radical scavenging activities. the extract at 500 ?g/ml showed maximum iron chelating activity (76.70%) followed by the scavenging of the abts+ radical (55.77%) at the same concentration. however, the extract showed only moderate hydroxyl radical scavenging activity (13.43%). total antioxidant capacity was found to be 24.18 mg ascorbic acid equivalents at 500 µg/ml extract concentration. there was a positive correlation between the total phenolic content and antioxidant capacity, r2 = 0.8547, whereas the correlation between the total flavonoids and antioxidant capacity was determined to be r2=0.8413. the results suggest that phenolics and flavonoids in the leaves provide substantial antioxidant activity.